Utilizing ytterbium- and erbium-doped fibers for a selectable and stable single-longitudinal-mode fiber ring laser

摘要

In this paper, a stable and wavelength-tunable C-band erbium-doped fiber (EDF) ring laser is experimentally demonstrated. Here, utilizing an unpumped ytterbium-doped fiber with a length of 0.6 m inside the ring cavity serving as a spatial multi-mode interference is proposed to suppress the multi-longitudinal-mode for single-longitudinal-mode output. Therefore, the output powers and optical signal-to-noise ratios of the proposed EDF ring laser are between -11.74 and -4.65 dBm and 34.3 and 26.9 dB, respectively. Moreover, the output performance of stability is also analyzed and discussed.